tidal bore vs tidal current

tidal bore and tidal current both are nouns.

Word	Noun	Adjective	Verb	Adverb
tidal bore	Yes	No	No	No
tidal current	Yes	No	No	No

As nouns, tidal current is a hypernym of tidal bore; that is, tidal current is a word with a broader meaning than tidal bore:

tidal bore: a high wave (often dangerous) caused by tidal flow (as by colliding tidal currents or in a narrow estuary)
tidal current: the water current caused by the tides

Other hypernyms of tidal bore include tidal flow.

tidal bore (noun)	tidal current (noun)
a high wave (often dangerous) caused by tidal flow (as by colliding tidal currents or in a narrow estuary)	the water current caused by the tides